US5829568A - Safety clamp - Google Patents

Safety clamp Download PDF

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Publication number
US5829568A
US5829568A US08/857,737 US85773797A US5829568A US 5829568 A US5829568 A US 5829568A US 85773797 A US85773797 A US 85773797A US 5829568 A US5829568 A US 5829568A
Authority
US
United States
Prior art keywords
spacer
base
cam
clamp
clamp assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/857,737
Other languages
English (en)
Inventor
Ajay K. Bhandari
Tim Kreja
Thomas W. Glissman
Clayton E. Bossert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pines Manufacturing
Original Assignee
Pines Manufacturing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pines Manufacturing filed Critical Pines Manufacturing
Assigned to PINES MANUFACTURING reassignment PINES MANUFACTURING ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOSSERT, CLAYTON E., BHANDARI, AJAY K., GLISSMAN, THOMAS W., KREJA, TIM
Priority to US08/857,737 priority Critical patent/US5829568A/en
Priority to CA002237244A priority patent/CA2237244C/en
Priority to IT98TO000408A priority patent/ITTO980408A1/it
Priority to DE19822007A priority patent/DE19822007C2/de
Priority to GB9810450A priority patent/GB2325190B/en
Priority to JP10134981A priority patent/JPH11156656A/ja
Priority to US09/118,632 priority patent/US5937687A/en
Publication of US5829568A publication Critical patent/US5829568A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/08—Arrangements for positively actuating jaws using cams

Definitions

  • a clamping die may hold a tube in a tube bending machine with hundreds or thousands of pounds of force. This magnitude of compression can easily crush human fingers.
  • the safety clamp of this invention has the significant advantage of being integral with the machine. Furthermore, it has both a mechanical and electrical safeguard to prevent an operator's hand from being caught in a clamping motion.
  • a unique feature of this invention is that the clamp will not complete its motion if an obstruction, such as a finger, is met during the closing motion. The protection is not dependent on human action or inaction. This invention protects even the most negligent operator and prevents injury under all conditions.
  • This invention includes a moveable or resilient member as part of a clamp that moves when an obstruction is met and blocks the final hard clamping action.
  • a microswitch also senses the position of the clamp and stops operation of the machine if an obstruction is met.
  • a workpiece clamp assembly which will not fully engage if an obstruction is in the closure path.
  • a base holds the workpiece holder of the clamp assembly, is spaced therefrom and is moveable relative to it.
  • a spacer is moveable between positions. A first position of the spacer allows the workpiece holder to move toward the base in case an obstruction is met thus leaving room for the obstruction without crushing it.
  • a second position of the spacer substantially blocks the space between the workpiece holder and the base thus making a substantially rigid connection between them.
  • FIG. 1 is a top view of a tube bender utilizing this invention
  • FIG. 2 is a top view of the clamp assembly of this invention
  • FIG. 3 is a side view of the clamp assembly of FIG. 2 in a first position
  • FIG. 3A is a side view of the clamp assembly of FIG. 2 in a second position
  • FIG. 4 is a section 4--4 of FIG. 3;
  • Fig. 5 is a partial side view of a moveable spacer and a partial cross-sectional view of its operating mechanism.
  • a tube bending machine 10 as shown in FIG. 1 includes a base 12, a controller and actuator 14 and a bending mechanism 16.
  • the controller and actuator 14 may be any one of many mechanisms which are known in the art.
  • U.S. Pat. Nos. 5,617,753 and 4,765,118 describe such a controller and actuator and these patents are hereby incorporated by reference in their entirety.
  • the bending mechanism 16 includes a bend die 18, pressure die 20 and a clamp die 22. They hold a tube 24 which is to be bent.
  • the operation of the bend die 18, pressure die 20 and clamp die 22 in holding and bending the tube can be done in many ways known in the art, some of which are described in the above-noted patents.
  • the clamp die 22 (FIGS. 1, 2, 3 and 3A) is held by a clamp assembly 26 which hold the clamp die 22.
  • the clamp assembly 26 includes a clamp die holder 28 which may, in general, be any workpiece holder in any kind of machine.
  • the clamp die holder has shaped grooves 30 and 32 formed by irregular shaped walls 34 and 36 to form top, bottom and side supports for the clamp die.
  • the clamp die has complementary "T" shaped rails (not shown) on the clamp die 22 which slide into the grooves 30 and 32 and are held securely and firmly therein. Any shape grooves and rails or other mechanism for securing the clamp die holder 28 and clamp die 22 may be used and will be known to one skilled in the art.
  • a base 38 is spaced from the clamp die holder 28 by a spacer 40.
  • the term "base” is used to mean anything to attach the parts herein.
  • the base 38 has a pair of shafts, holes or tunnels 42 and 44 which pass through its length.
  • Rods 46 and 48 pass through the holes 42 and 44 and are slideably engaged therewith.
  • the rods 46 and 48 may be any appropriate shape and material and may be simple bolts having heads 50 and 52 which fit into expanded portions 54 and 56 of holes 42 and 44.
  • the ends 58 and 60 of rods 46 and 48 are secured to the clamp die holder 28 by such means as threads, a press fit or various other devices. There may be more or less than two rods but two rods have been found to work well.
  • Spring 59 and 61 fits over the rods 46 and 48 and bias the clamp die holder 28 away from the base 38 by pressing against abutments on both of them.
  • the spacer 40 may have any appropriate shape. It is necessary, however, that it is formed and placed in such a manner that it moves between different positions (FIGS. 3, 3A and 5). In a first position, it must allow the clamp die holder 28 to move toward the base 38. In a second position (FIG. 3A and dotted in FIG. 5), it must block the clamp die holder from moving toward the base 38.
  • the spacer 40 has end pieces 41 and 43 separated by a bar 62. Fasteners 63 and 64 connect the ends 41 and 43 with the rod 62. An extension 66 from the base 38 having an opening therein fits around the bar 62 and allows the spacer 40 to move up and down therein.
  • a spring 68 fits around the bar 62 and its ends engage the spacer end piece 43 and extension 66 thus biasing the spacer 40 downwardly.
  • a channel 70 (FIG. 3 and 3A) formed on the back of the clamp die holder is larger than the end piece 43 and will fit around it if the clamp die holder moves toward the housing 26.
  • Other biasing devices and mechanisms will be obvious to move the spacer 40 into and out of the first and second positions.
  • a first microswitch 72 is positioned to sense the position of the clamp die holder and will notify the tube bender actuator controller if the clamp die holder 28 has moved toward the clamp die base 38.
  • a projection 74 hits a contact 76 which keeps microswitch 72 in a normally closed position when the clamp die holder 28 is in the extended (normal) position as shown in FIG. 3.
  • a swinging arm 77 holds the contact 76 in place and allows it to move rearward.
  • Springs 59 and 61 bias the clamp die holder 28 in the normal position. Head 52 keeps arm 77 and contact 76 against switch 72.
  • a gear 80 is rotatably attached to the base 38 by means of a shaft 82 held by a key 83.
  • the shaft 82 is mounted in a bushing 84.
  • a pull knob 85 is attached to the gear 80 by means of a sleeve 81.
  • the structure of the gear 80, shaft 82 and pull handle is designed so that the gear handle can be used to pull the gear 80 off of and onto a rack 86 with teeth 87 on which the gear rides.
  • FIGS. 4 and 5 illustrate a first cam 88 formed of two plates 89 and 90.
  • the plate 90 has a dowel pin 92 that travels in a slot 94 in plate 89.
  • This arrangement permits plate 90, which is attached to the shaft 82, to drive the plate 89 only after the dowel pin 92 has moved the length of the slot.
  • One plate normally allows movement of the spacer in one direction by means of one cam surface.
  • the second plate allows or causes movement of the spacer in the other direction by means of a second cam surface. Since the plates 89 and 90 are rotatable relative to one and the other, the timing on the shaft 82 of the movement of the spacer 40 can be adjusted in both directions. This adjustment also permits adjustment of the safety spacing between the clamping die and the bend die as discussed later. The manufacturer sets this adjustment and not the user.
  • the cam 88 could also be a single plate with different cam surfaces.
  • a second cam 94 virtually identical to the first cam is also attached to the shaft 82.
  • a cam follower 96 is mounted in proximity to the cam 88.
  • One end 98 follows the contour of the cam and the other end 100 engages the end 43 of the spacer 40.
  • a third microswitch 101 senses the position of the gear 80 relative to the rack 86. It signals if the gear 80 is either in contact or not in contact with the rack 86. The non engaged position of the gear and rack is accomplished by pulling on the pull knob 85. If this is done, the third microswitch 101 signals the controller and actuator that the machine is in the "set up" mode. That is, the tube or workpiece is being placed in the machine. During the set up mode, the clamp die holder can be moved freely on a slide (not shown) back and forth because the gear 80 is not engaged with the rack 86.
  • the pull knob 85 (FIGS. 3 and 4) is used to move the gear 80 off of the rack 86.
  • the microswitch 101 disables the actuator for safety purposes.
  • a spring 102 (FIG. 4) will normally be connected to and rotate shaft 82 and cams 88 and 94 which move cam follower 96 and allows the spacer 40 to drop to the hard or second position.
  • the second microswitch 78 signals to the controller and actuator that the clamp die holder has fully engaged the tubing.
  • a 1/16" travel gap may be left for the clamp die holder to allow smooth movement of the spacer 40 without binding.
  • the clamp die holder 26 continues its closing movement until the clamp die holder 28, the spacer 40 and the base 38 form a solid path to the tube 24 and thus forms the closed or hard or second position.
  • the first microswitch 72 is closed and the second microswitch 78 is open.
  • a safety release mode automatically occurs if there is an obstruction, such as a person's finger between the clamp die and the bend die.
  • the operation is as described above but the spacer 40 does not drop into place between the clamp die holder 28 and the base 38. If an obstruction is present, the clamp die holder 28 will start to move to the right but will stop when the obstruction is met and the springs 59 and 61 (FIG. 3), will be compressed. Alternately, one spring could be used. When the springs are compressed, the space between the clamp die 28 and base 38 will be too small for the spacer 40 to drop between them. If enough compression occurs, the top of the clamp die 28 will move under the end 41 and physically prohibit movement of spacer 40.
  • the shafts 46 and 48 will also move rearwardly and open first microswitch 72 which immediately signals the controller to stop the clamping process and start the unclamp sequence. In this manner, both 1 mechanical and electrical safeguards prevent injury to an operator. Again, no action is required by the operator to trigger the safety mechanisms.
  • an actuator moves the clamp die base 38 away from the tube 24 which turns the gear 80 counterclockwise.
  • the gear 80 turns the cams via the shaft and the dowel pins in slots until the cam follower 96 forces the spacer back up to the first or soft clamp position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Finger-Pressure Massage (AREA)
  • Jigs For Machine Tools (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
US08/857,737 1997-05-16 1997-05-16 Safety clamp Expired - Fee Related US5829568A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US08/857,737 US5829568A (en) 1997-05-16 1997-05-16 Safety clamp
CA002237244A CA2237244C (en) 1997-05-16 1998-05-08 Safety clamp
IT98TO000408A ITTO980408A1 (it) 1997-05-16 1998-05-15 Serraggio di sicurezza
DE19822007A DE19822007C2 (de) 1997-05-16 1998-05-15 Klemmvorrichtung zum Halten eines Werkstücks
GB9810450A GB2325190B (en) 1997-05-16 1998-05-18 Clamp assembly for workpieces,and a tube bending machine incorporating such a clamp assembly
JP10134981A JPH11156656A (ja) 1997-05-16 1998-05-18 安全クランプ
US09/118,632 US5937687A (en) 1997-05-16 1998-07-17 Safety clamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/857,737 US5829568A (en) 1997-05-16 1997-05-16 Safety clamp

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/118,632 Division US5937687A (en) 1997-05-16 1998-07-17 Safety clamp

Publications (1)

Publication Number Publication Date
US5829568A true US5829568A (en) 1998-11-03

Family

ID=25326641

Family Applications (2)

Application Number Title Priority Date Filing Date
US08/857,737 Expired - Fee Related US5829568A (en) 1997-05-16 1997-05-16 Safety clamp
US09/118,632 Expired - Fee Related US5937687A (en) 1997-05-16 1998-07-17 Safety clamp

Family Applications After (1)

Application Number Title Priority Date Filing Date
US09/118,632 Expired - Fee Related US5937687A (en) 1997-05-16 1998-07-17 Safety clamp

Country Status (6)

Country Link
US (2) US5829568A (it)
JP (1) JPH11156656A (it)
CA (1) CA2237244C (it)
DE (1) DE19822007C2 (it)
GB (1) GB2325190B (it)
IT (1) ITTO980408A1 (it)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102513856A (zh) * 2011-12-14 2012-06-27 常州市永益工具有限公司 压紧装置
CN103433738A (zh) * 2013-08-19 2013-12-11 德州亚太集团有限公司 组合式空调机组段间连接用箱体错位矫正器
CN104690145A (zh) * 2015-03-20 2015-06-10 苏州汇程精密模具有限公司 一种机械连续复合模具
CN104722646A (zh) * 2015-03-13 2015-06-24 苏州汇程精密模具有限公司 一种模具
CN105312820A (zh) * 2015-11-27 2016-02-10 芜湖银星汽车零部件有限公司 一种汽车后悬置支架用通孔扣锁装置
CN106881411A (zh) * 2017-04-18 2017-06-23 苏州汇程精密模具有限公司 一种具有移动限位功能的冲切模具滑块
CN107470935A (zh) * 2017-07-31 2017-12-15 常州信息职业技术学院 多点夹紧的夹具
CN107617904A (zh) * 2017-08-31 2018-01-23 安徽工程大学 一种工件同步压紧固定机构
CN108856387A (zh) * 2018-07-18 2018-11-23 重庆祥越管道配件制造有限公司 管件弯折工装
CN110202072A (zh) * 2019-07-23 2019-09-06 河南鑫安利安全科技股份有限公司 一种工业冲压作业安全防护装置
CN110238310A (zh) * 2019-07-23 2019-09-17 河南鑫安利安全科技股份有限公司 一种小型连续冲压式冲床安全防护装置

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1270104B1 (en) * 2000-02-17 2009-11-04 Sanoh Kogyo Kabushiki Kaisha Bending machine
US7251976B2 (en) * 2003-07-01 2007-08-07 Gm Global Technology Operations, Inc. Apparatus and method for the noncircular bending of tubes
FR2931451B1 (fr) * 2008-05-22 2010-12-17 Fmc Technologies Sa Dispositif de commande pour systeme de chargement et/ou dechargement de fluides
CN104070370B (zh) * 2013-03-25 2016-08-03 富泰华工业（深圳）有限公司 装夹装置
CN107433475B (zh) * 2017-09-14 2023-05-26 福州荣林机械有限公司 一种工件定位夹具
CN107775393B (zh) * 2017-10-31 2019-04-09 常州信息职业技术学院 偏心夹紧装置
CN114669790A (zh) * 2022-04-22 2022-06-28 苏州乔勋精密机械有限公司 一种用于不规则工件的切割机及其操作方法
CN116037778B (zh) * 2023-01-06 2023-09-26 江苏科彦汽车配件有限公司 一种多工位等高拉伸工装模

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311441A (en) * 1941-11-01 1943-02-16 Lloyd D James Safety device for presses and the like
US2694820A (en) * 1951-03-23 1954-11-23 United Shoe Machinery Corp Clamping mechanism
US2745303A (en) * 1954-06-25 1956-05-15 Vlier Engineering Inc Thumb screw with overload release means
US3218058A (en) * 1964-02-17 1965-11-16 Monogram Ind Inc Quick adjustable clamp
US4691553A (en) * 1986-03-06 1987-09-08 Barber Stephen C Safety power tool
US4694671A (en) * 1984-05-03 1987-09-22 Leslie Hartridge Limited Press incorporating saftey system
US4848723A (en) * 1985-02-11 1989-07-18 Borzym John J Overload protector for clamping jaw mechanism
US5056766A (en) * 1989-06-16 1991-10-15 Eddy Engibarov Precision machine vise

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355793A (en) * 1981-02-06 1982-10-26 Juneau Raymond L Vertical and horizontal clamp for T-slot
US5343725A (en) * 1993-07-07 1994-09-06 Eagle Precision Technologies Inc. Tube bending apparatus and method
DE9418324U1 (de) * 1994-11-15 1995-01-19 SEBA AUTOMATION GmbH, 01474 Weißig Sicherungseinrichtung zur Verhinderung des Eingriffs in den Arbeitsbereich von Umformwerkzeugen
IT1278066B1 (it) * 1995-05-12 1997-11-17 Cml Costr Mecc Liri Srl Gruppo di bloccaggio e traino di un tubo o profilato per macchine curvatubi con o senza anima interna e piegaferri, e macchine per il
US5617753A (en) * 1995-10-06 1997-04-08 Pines Manufacturing Low force auto-open tooling for tube bending machine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311441A (en) * 1941-11-01 1943-02-16 Lloyd D James Safety device for presses and the like
US2694820A (en) * 1951-03-23 1954-11-23 United Shoe Machinery Corp Clamping mechanism
US2745303A (en) * 1954-06-25 1956-05-15 Vlier Engineering Inc Thumb screw with overload release means
US3218058A (en) * 1964-02-17 1965-11-16 Monogram Ind Inc Quick adjustable clamp
US4694671A (en) * 1984-05-03 1987-09-22 Leslie Hartridge Limited Press incorporating saftey system
US4848723A (en) * 1985-02-11 1989-07-18 Borzym John J Overload protector for clamping jaw mechanism
US4691553A (en) * 1986-03-06 1987-09-08 Barber Stephen C Safety power tool
US5056766A (en) * 1989-06-16 1991-10-15 Eddy Engibarov Precision machine vise

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102513856A (zh) * 2011-12-14 2012-06-27 常州市永益工具有限公司 压紧装置
CN103433738A (zh) * 2013-08-19 2013-12-11 德州亚太集团有限公司 组合式空调机组段间连接用箱体错位矫正器
CN104722646A (zh) * 2015-03-13 2015-06-24 苏州汇程精密模具有限公司 一种模具
CN104690145A (zh) * 2015-03-20 2015-06-10 苏州汇程精密模具有限公司 一种机械连续复合模具
CN105312820A (zh) * 2015-11-27 2016-02-10 芜湖银星汽车零部件有限公司 一种汽车后悬置支架用通孔扣锁装置
CN106881411A (zh) * 2017-04-18 2017-06-23 苏州汇程精密模具有限公司 一种具有移动限位功能的冲切模具滑块
CN107470935A (zh) * 2017-07-31 2017-12-15 常州信息职业技术学院 多点夹紧的夹具
CN107470935B (zh) * 2017-07-31 2019-04-05 常州信息职业技术学院 多点夹紧的夹具
CN107617904A (zh) * 2017-08-31 2018-01-23 安徽工程大学 一种工件同步压紧固定机构
CN108856387A (zh) * 2018-07-18 2018-11-23 重庆祥越管道配件制造有限公司 管件弯折工装
CN108856387B (zh) * 2018-07-18 2024-04-02 浙江联茂建设工程有限公司 管件弯折工装
CN110202072A (zh) * 2019-07-23 2019-09-06 河南鑫安利安全科技股份有限公司 一种工业冲压作业安全防护装置
CN110238310A (zh) * 2019-07-23 2019-09-17 河南鑫安利安全科技股份有限公司 一种小型连续冲压式冲床安全防护装置
CN110202072B (zh) * 2019-07-23 2020-02-21 河南鑫安利安全科技股份有限公司 一种工业冲压作业安全防护装置
CN110238310B (zh) * 2019-07-23 2020-06-23 广东吉盛机电设备有限公司 一种小型连续冲压式冲床安全防护装置

Also Published As

Publication number Publication date
CA2237244A1 (en) 1998-11-16
JPH11156656A (ja) 1999-06-15
DE19822007C2 (de) 2001-07-26
GB9810450D0 (en) 1998-07-15
GB2325190B (en) 2000-08-16
ITTO980408A1 (it) 1999-11-15
CA2237244C (en) 2002-01-15
US5937687A (en) 1999-08-17
DE19822007A1 (de) 1998-12-17
GB2325190A (en) 1998-11-18

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BHANDARI, AJAY K.;KREJA, TIM;GLISSMAN, THOMAS W.;AND OTHERS;REEL/FRAME:008567/0296;SIGNING DATES FROM 19970507 TO 19970508

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